Pediatric & Congenital Glaucoma

The anterior chamber angle and trabecular meshwork develop from neural crest-derived tissue during gestation. Normal development allows the angle to "cleave" properly, opening a functional trabecular meshwork. In primary congenital glaucoma (PCG), this process is incomplete — a condition called trabeculodysgenesis — leaving an abnormal, obstructive angle from birth.

Pediatric glaucoma is a heterogeneous group of conditions causing elevated IOP and optic nerve damage in infants and children, and remains a major, largely preventable cause of childhood blindness.² It is broadly divided into primary congenital glaucoma and glaucoma associated with anterior segment dysgenesis (ASD) syndromes.

In classic PCG, trabeculodysgenesis impairs aqueous outflow, currently classified into clinical subtypes based on gonioscopic angle appearance.² In ASD-associated glaucoma, disrupted neural crest cell differentiation during anterior segment development produces structural angle anomalies (iridocorneal adhesions, abnormal iris insertion, incomplete angle cleavage) that similarly obstruct outflow, with the specific gene defect (e.g., PAX6 in aniridia, PITX2 or FOXC1 in Axenfeld-Rieger syndrome) shaping both the ocular phenotype and systemic associations.²³

The classic triad of PCG is epiphora, photophobia, and blepharospasm. Because the infant sclera and cornea are more distensible than in adults, sustained elevated IOP causes progressive globe/corneal enlargement (buphthalmos), corneal edema, and Haab's striae (curvilinear Descemet's membrane breaks). In ASD syndromes like Axenfeld-Rieger, additional findings include posterior embryotoxon, corectopia, polycoria, and iris hypoplasia, often with systemic features (dental anomalies, umbilical defects, hearing loss, cardiac anomalies).³

Differential diagnosis includes congenital nasolacrimal duct obstruction (tearing without photophobia, corneal enlargement, or elevated IOP — far more common and benign), megalocornea (large but structurally normal, normal IOP), birth trauma (Descemet's breaks typically vertical/oblique, unilateral, without elevated IOP), and metabolic/storage disorders with corneal clouding.

Diagnosis requires slit-lamp biomicroscopy, tonometry, gonioscopy, corneal diameter/pachymetry measurement, and optic disc assessment — often performed under examination under anesthesia (EUA) given the difficulty of cooperative exam in infants. Modern diagnostic strategies increasingly integrate anterior segment imaging with next-generation sequencing to improve early detection and prognostic accuracy, particularly for ASD-associated cases.²

Surgery is the primary treatment for PCG, in contrast to adult glaucoma where medical therapy is often first-line: angle surgery (goniotomy or trabeculotomy) is the mainstay, directly addressing the trabeculodysgenesis. In a five-year single-center surgical series, mean preoperative IOP was 32 mmHg, surgery produced significant reductions in IOP and corneal diameter, optic disc cupping reversed in most cases, and only 2 of 31 eyes required additional surgery, with no significant intraoperative complications.¹ Medical therapy is used as a temporizing measure before surgery or when angle surgery alone is insufficient. ASD-associated glaucoma requires individualized surgical and medical approaches based on the underlying genetic mechanism and angle anatomy.²

• The classic triad — epiphora, photophobia, blepharospasm — in an infant should prompt urgent ophthalmology referral, not be dismissed as simple nasolacrimal duct obstruction
• Corneal enlargement (buphthalmos) and Haab's striae distinguish PCG from more benign causes of infant tearing
• Unlike adults, optic disc cupping in infants can partially reverse with adequate, timely IOP control
• Common pitfall: delaying ophthalmology referral, missing the window where early surgery produces the best outcomes
• Common pitfall: assuming medical therapy alone is adequate first-line management for PCG, rather than recognizing surgery as the primary treatment